Coffee machine



FIG. 1 is a perspective view of a coffee machine, showing our new design from the front, left side and top;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a right side elevational view thereof. 

CLAIM The ornamental design for a coffee machine, as shown and described. 